Which scales are supported?
Architectural scales from 1/16 inch equals 1 foot to 1 inch equals 1 foot, plus common metric ratios and a custom metric ratio.
Calculate blueprint scale in either direction
Convert drawing distances to real distances, reverse the calculation, or calibrate a PDF before you start measuring.
Scale calculator
Calibrate a PDF plan
Open a PDF plan in the workspace, choose a sheet, and set scale from two known points.
How scale affects quantities
A length changes linearly with scale. An area changes with the square of the scale, so calibrate each sheet before dimensional takeoff.
Frequently asked questions
Can I continue into takeoff?
Yes. The calculator links directly to the local workspace; PDF calibration is preserved with the same local document.